FrostyTech.com Mk.II Synthetic Thermal Heatsink Test Results Results based on readings from a 38x38mm copper interface die with 125W heat load on the Mk.II Test Platform. Thermal Test values for each heatsink were calculated by determining the rise over ambient temperature at time of test. Information on Frostytech's test methodology is available here. Socket 939/940/754 compatible CPU heatsinks
manufacturer:	model no.:	*fan speed:	125w thermal test (°c)	noise level (dba)
Gigabyte	G-Power Pro	high	18.6	71.9
Coolermaster	Hyper6	high	20.5	54.7
Thermaltake	Venus 12	high	21.7	68.1
ASUS	Starice	high	22.8	67.4
Coolermaster	Aquagate Mini	high	23.2	59.2
Thermaltake	Polo 735	high	23.4	68.0
Cooljag	SFO-H	high	23.6	60.6
Alpha	PAL-8150		23.7	58.9
Zalman	CNPS9500LED (clip parallel)	high	23.8	50.3
AVC	Z7U3301001 (stock 939)	high	24.6	59.9
Gigabyte	3D Cooler-Ultra	high	24.8	63.0
Scythe	Shogun	high	26.0	45.9
EKL	V8	high	26.3	57.5
Gigabyte	3D Rocket-Pro	high	26.9	56.7
Gigabyte	3D Cooler-Pro	high	27.0	62.5
Gigabyte	3D-Rocket		28.9	50.7
Vantec	Mach1	high	29.2	56.9
CoolJag	SFO-D(18SC)		29.6	64.0
Zalman	CNPS7000A-Cu	high	30.3	45.2
Dynatron	SK-V24		30.3	56.4
Zalman	CNPS7000-Cu	high	31.0	45.2
Coolermaster	Hyper48		31.7	43.6
Scythe	Kama SCKK1000		31.9	47.5
Scythe	Samurai SCSM1000	high	32.1	51.6
Zalman	CNPS7000B-CU	high	32.3	44.9
Thermaltake	Silentboost K8		32.3	49.7
Jetart	JAX801		33.2	53.5
Dynatron	A22		34.5	44.5
nPowertek	NPH K8-1		34.6	52.2
Ajigo	MF043-044 (stock 754)		35.0	45.4
Verax	Quattro 1		36.9	30.9
Gigabyte	NeonCooler 8-BL		37.7	42.0
Titan	TTC-K8ATB/825/SC		38.7	63.1
Cooljag	SFO-H	low	39.8	43.0
Evercool	K802-715		42.1	51.5
Evercool	Magic Cooler		46.6	55.5
			125w thermal test (°c)	noise level (dba)
*heatsinks are ranked according to the 125w thermal test results column (rise over ambient temp.). low temperatures with low noise levels are considered best. for reference heatsinks with variable-speed fans, only the high speed (12v) fan test result is included in the comparison sheet; more detailed results reside in each specific heatsink review.

Testing heatsinks which have fan speed dictated by a sub-motor mounted thermistor can be problematic. If ambient temperatures do not rise above the threshold for the sensor, the fan's speed does not increase. In much the same way, if a computer is crunching data and the processor is running hot but ambient case air temperatures are low, the heatsink's fan will not alter its speed. This can lead to overheating for the sake of lower fan noise because the thermistor is not reacting to the temperature which really matters most. Conversely, users with computer cases have high ambient temperatures (the result of poor airflow) may suffer from excessive noise because the heatsink's fan is running at full speed when it's really not necessary.

In any case, as a high powered AMD Athlon64 heatsink the Cooljag SFO-H (68YC) performs very well. On the synthetic test platform it achieves an excellent rise above ambient temperature result of 23.6°C with the fan spinning at full speed (60 dBA).

However, with the fan at its lowest RPM, the Cooljag SFO-H (68YC) is clearly not the best low noise heatsink on the market. The cooler maintains a rather high rise above ambient temperature of 39.8°C, indicating that the fin design works best with a sustained flow of air moving through its skived copper fins. Where noise is not an issue this heatsink performs great, so long as ambient case temperatures are high enough. The real world effectiveness of the Cooljag SFO-H (68YC) is thus quite unpredictable, and that is something any potential end user should be mindful of.

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